Merge pull request #3600 from dtrudg/prep-4.3.0

chore: prepare 4.3.0 release

Author: dtrudg

CHANGELOG.md

@@ -1,6 +1,6 @@
 # SingularityCE Changelog
 
-## 4.3.0-rc.1 Release Candidate \[2025-03-04\]
+## 4.3.0 \[2025-03-13\]
 
 ### Behaviour Changes
 

INSTALL.md

@@ -227,11 +227,11 @@ git submodule update --init
 By default your clone will be on the `main` branch which is where development
 of SingularityCE happens. To build a specific version of SingularityCE, check
 out a [release tag](https://github.com/sylabs/singularity/tags) before
-compiling. E.g. to build the 4.3.0-rc.1 release candidate, checkout the
-`v4.3.0-rc.1` tag:
+compiling. E.g. to build the 4.3.0 release, checkout the
+`v4.3.0` tag:
 
 ```sh
-git checkout --recurse-submodules v4.3.0-rc.1
+git checkout --recurse-submodules v4.3.0
 ```
 
 ## Compiling SingularityCE
@@ -334,7 +334,7 @@ build and install the RPM like this:
 <!-- markdownlint-disable MD013 -->
 
 ```sh
-export VERSION=4.3.0-rc.1 # this is the singularity version, change as you need
+export VERSION=4.3.0 # this is the singularity version, change as you need
 
 # Fetch the source
 wget https://github.com/sylabs/singularity/releases/download/v${VERSION}/singularity-ce-${VERSION}.tar.gz